| 摘要 |
[Problem] To make it possible to delay frost accumulation on a heat sink with as little change as possible to the action of a decompression unit, so as not to adversely affect the coefficient of performance COP of a heat pump cycle. [Solution] An air conditioning device for a vehicle is provided with an air-blowing unit (32), a compressor (11), heat radiators (12, 25, 34), a decompression unit (14), a heat sink (15), and a control device (40). The air-blowing unit blows air into the vehicle interior. The compressor compresses and discharges a refrigerant. The heat radiators radiate the heat of the refrigerant discharged from the compressor, and use the heat radiated from the refrigerant to heat the air. The decompression unit decompresses the refrigerant from which heat has been radiated by the radiators. The heat sink causes the refrigerant decompressed by the decompression unit to absorb heat from outside air. The control device determines whether or not there is a state of frost accumulation in which frost has accumulated on the heat sink, or a state of frost accumulation danger in which there is a danger of frost accumulation, and when the control device has determined that there is a state of frost accumulation or a state of frost accumulation danger, the control device performs frost accumulation delay control which increases the high-pressure-side pressure of the refrigerant in order to delay frost accumulation. |
